Many thanks to SRAA contributor, Eddie Malphrus‎, who shares the following recording and notes:

It was 41 years ago today that my letter was read on-air during HCJB's Weekend Passport program. The show aired 2x on Sundays and I listened to the early broadcast - and therefore was ready to record during the evening broadcast. It's still fun to listen back to this brief but memorable moment.

[The recording] includes a puny-sounding "me" at 15 years old, testing the mic on my cassette recorder. I left it in as it was part of my memory. :)